1H NMR, 13C NMR and mass spectral studies of some Schiff bases derived from 3-amino-1,2,4-triazole

Synthesis, spectral characterization and biological studies of transition metal(II) complexes with triazole Schiff bases

“…The 13 C NMR spectra of the Schiff base ligands ( L1 , L2 , L3 ) and their Zn(II) complexes were taken in DMSO‐d 6 . The 13 C NMR spectral data are reported along with their possible assignments in the Experimental section and all the carbons were found in their expected region . The conclusions drawn from these studies provided further support to the modes of bonding already explained in the IR and 1 H NMR spectral data.…”

“…Conversely, the same proton C 4 ‐ H of ligand L3 was observed downfield at 7.85 ppm due to the presence of the electron‐withdrawing effect of the NO 2 group at the 5‐ position. A broad singlet displayed the N H proton of triazole at 13.95–14.20 ppm in all the ligands. The coordination of the azomethine (C H ═N) nitrogen and C═N of the triazole ring nitrogen was assigned by the downfield shifting of azomethine (C 6 ‐ H ) and triazole (C 8 ‐ H) protons present originally at 8.90–9.25 and 8.40–8.62 ppm in the free ligands, which moved to 9.33–9.63 and 8.78–8.96 ppm in the spectra of their zinc(II) complexes, respectively.…”

Spectral investigation of the intramolecular charge-transfer in some aminotriazole Schiff bases

“…They further concluded that the electronegativity of the different substituents that are attached to the phenyl ring, had a marked effect on the intramolecular charge-transfer (CT) within the molecules in question. They confirmed their results by the different schemes of fragmentation in the mass spectral analysis [12].…”

“…All the chemicals used were analytical grade from either Fluka (Germany) or Aldrich (USA), whereas, the heterocyclic Schiff bases were prepared according to a previously reported method [12].…”

Photoluminescence and labelling for microcrack bone of N-salicylidene-3-amino-1,2,4-triazole

“…Synthesis of N-salicylidene-3-amino-1,2,4-triazole SAT was synthesized according to the reported method in reference [26]. A solution of salicylaldehyde (4.80 g, 0.04 mol) dissolved in ethanol (10 mL) was added to a solution of 3-amino-1,2,4-triazole (3.44 g, 0.04 mol) in ethanol (10 mL).…”